Commutator reconditioning device



Nav. 24, 1942.

Filed Feb. 19, 1941 gill .A. L. BAURHENN GOMMUTATOR RECONDITIONINGDEVICE 4 Sheets-Sheet l Inventor I A ttorney NOV. 24, 1942. BAURHENN2,303,106

COMMUTATOR RECONDIT IONING DEVICE Filed Feb. 19, 1941 4 Sheets-Sheet 2Z? 9 r ////l l\ 1 2 V//// //1 I Inventor 110%} Z tr/fl A ttorney Nov.24, 1942. A. L. BAURHENN 2,303,106

COMMU'I'ATOR RECONDITIONING DEVICE Filed Feb. 19, 1941 4 Sheets-Sheet 51 s 11 we" Q I mr S gy/i Z. ze ri zw A ttoruey Nov. 24, 1942.v A. L.BAURHENN 2,303,105

' CQMMUTATOR RECONDITIONING DEV-ICE- Filed Feb. l9, 1941 4 Sheets-Sheet4 I m'entor 149 Z. 34 (i/e7 A Home Patented Nov. 24, 1942 COMMUTATORRECONDITIONING DEVICE Adolph L. Baurhenn, New York, N. Y.

Application February 19, 1941, Serial No. 379,677

2 Claims.

This invention relates to a commutator reconditioningdevice, and has forthe primary object the provision of a device of this character which maybe readily adapted to a lathe to quickly and accurately cut theinsulation between the commutator bars of an electric armature supportedby the lathe and thereby bring the grooves be-' tween the bars to aproper depth and to remove any abrasions or particles that may be on thesides of the commutator bars after the latter have been turned down inthe reconditioning operation, alsoby changing the cutting tool of thedevice the latter may be successfully employed-for turning down thebrush faces of the commutator bars prior to the operation of cutlathe,the commutator of which is indicated by the character 8. .It is a wellknown fact that after an electric armature has been in use for a periodof time the bars 9 of the commutator 8 become worn or pitted so that thebrushes of v the motor or generator of which the armature ting theinsulation and deepening the grooves of the commutator.

With these and other objects in view as will become more apparent as thedescription proceeds, the invention consists in certain novel featuresof construction, combination and arrangement of parts as will behereinafter more fully, described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which Figure lis a fragmentary top plan view showing a portion of a lathe supportingan electric armature and equipped with a reconditioning deviceconstructed in accordance with my invention.

Figure 2 is an end elevation illustrating the device mountd on a portionof the lathe.

Figure 3 is a side elevation illustrating the device.

Figure 4 is a vertical sectional view illustrating a supporting post ofthe device.

Figure 5 is a sectional view taken on the line 5-5 of Figure 1.

Figure 6 is a perspective view illustrating a spacer.

Figure '7 is a sectional view taken on the line 1-1 of Fi ure 1.

Figure 8 is a detail sectional view taken on the line 8--8 of Figure 1.

Figure 9 is a top plan view illustrating a modifled form of myinvention.

Figure 10 is a sectional view taken on the line lll0 of Figure 9.

Figure 11 is a fragmentary sectional view taken on the line ll-ll ofFigure 10.

Referring in detail to the drawings, the numeral 5 indicates a lathe ofa conventional construction including the usual tool holder 6. Anelectric armature l is shown as supported by the forms a part fail toride evenly and smoothly on the commutator. Therefore, the bars must beturned down to bring the commutator 8 in proper condition to be engagedby the brushes. In the reconditioning of the bars they are cut away by asuitable tool and after this reconditioning operation it is necessarythat the insulation also be cut away to deepen the grooves between thebars and to remove any abrasions or particles that may be on the sidefaces of the'bars. To permit this further reconditioning operation to bequickly and accurately carried out the present invention is employedwhich also, by adapting thereto a proper cutter or tool, may be employedfor the initial reconditioning or turning down of the brush faces of thebars.

To adapt the present invention to the lathe the usual tool post of thetool carriage 6 is removed and a post l0 substituted in lieu thereof.This post Ill assumes a vertical position on the tool carriage 6 and hasa groove 1 l and a head l2 to fit in the usual notch l3 of the toolcarriage 6 and to be held therein by a clamping nut l4 threaded on thepost l0.

Mounted for vertical adjustment on the post I0- Formed on the sleeve I5is a horizontally disposed split sleeve l8 for slidably supporting acutter carrying plunger IS. The sleeve l8 has stud bolts 20 whereby thegrip of the sleeve on the plunger l9 maybe increased and decreased asdesired.

The plunger is is provided with a slot 2| in which is clamped the shankof a cutter 22 by a set screw 23. This cutter is for the purpose ofcutting th insulation between the bars 9 and the commutator and therebybring the grooves between the bars to a proper depth.

Should it be desired to recondition the faces of the bars of thecommutator another tool is substituted in lieu of the tool 22.

A hand lever 24 is pivoted to the plunger l9 and its fulcrum isindicated at 25. The plunger l9 may be reciprocated by the hand lever tomove the cutting tool parallel to the bars 9 within the grooves of thecommutator for cutting the insulation. The fulcrum 25 is in the form ofa link 26 pivoted the lever 24 and to the sleeve I! by using one of thestud bolts.

A bracket 21 is supported on the sleeve I! by the stud bolts 20 andcarries a bolt 28 which also extends through a bearing 29 of a spacer30. The spacer 30 besides including a finger piece II also includes agroove engaging end 32. The spacer is substantially L-shaped, as shownin Figure one portion of which is provided with slots 33 to receive thefasteners 34 of the bearing 29 permitting the spacer to be adjustedtoward and from the tool 22 so that the device may be made to operatsuccessfully in connection with commutators wherein the distancesbetween the grooves vary.

The end 32 oi. th spacer is adapted to ride into and out of the groovesof the commutator as the armature 1 is rotated on the lathe and when inengagement with a groove will position the commutator so that anothergroove will b in proper position to be acted on by the tool 22 duringthe reciprocation of the plunger 18.

It is to be understood that the bearing 29 and its fasteners 34 providea construction which will frictionally grip the spacer to hold the sameagainst accidental movement but which will permit the end 32 to rideinto and out of the grooves of the commutator as the armature is rotateddue to the flexibility of the spacer.

Referring to my modified form of the invention, the major constructionof which is substantially the same as the form heretofore described indetail and the principal difference residing in the fact that the toolpost sleeve 34 has the plunger sleeve 35 slidably mounted thereonwhereby the sleeve 35 may be adjusted vertically for the purpose ofregulating the depth the groove is cut in the commutator by the tool.

An adjusting stem 36 is threaded in the sleeve 35 and is journaled onthe sleeve 34. whereby the sleeve 35 may be adjusted vertically withrespect to the sleeve 34 for varying the depth of th out made by thetool of the plunger.

While I have shown and described the prei'erred embodiment of myinvention, it will be understood that minor changes in construction,combination and arrangement of parts may be made without departing fromthe spirit and scope of the invention as claimed.

Having thus described my invention, what I claim is:

1. Reconditioning apparatus for use on the tool holder of a lathe and toregroove the commutator of an armature rotatably mounted in the lathe,said apparatus comprising a post adapted to be secured to said holder inupright position, a sleeve vertically adjustable on said post intodifierent set positions and having a second sleeve fixed thereon at aright angle thereto, a tool holding plunger endwise slidable in thesecond-mentioned sleeve, a tool detachably mounted on said holder,manipulative means for sliding said plunger, and means on said secondsleeve for holding the commutator in diflerent angular positions andconstructed and arranged to yieldingly engage the grooves in thecommutator under rotation of the latter into different angularpositions.

2. Reconditioning apparatus for use on the tool holder of a lathe and toregroove the commutator 01' an armature rotatably mounted in the lathe,said apparatus comprising a post adapted to be secured to said holder inupright position, a sleeve vertically adjustable on said post intodiflerent set positions and having a second sleeve fixed thereon at aright angle thereto, a tool holding plunger endwise slidable in thesecond-mentioned sleeve, a tool detachably mounted on said holder,manipulative means for sliding said plunger, and means on said secondsleeve for holding the commutator in diflerent angular positions andconstructed and arranged to yieldingly engage the grooves in thecommutator under rotation of the latter into difierent angularpositions, said last means comprising a right angled member of resilientmetal and including a finger piece and a groove engaging end, the memberbeing mounted on the second sleeve for rotary setting and to variablytension the groove engaging end against the commutator.

ADOLPH L. BAURHENN.

